@article{ASNSP_2009_5_8_1_117_0,
     author = {Baldi, Pietro},
     title = {Periodic solutions of forced {Kirchhoff} equations},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {117--141},
     publisher = {Scuola Normale Superiore, Pisa},
     volume = {Ser. 5, 8},
     number = {1},
     year = {2009},
     mrnumber = {2512203},
     zbl = {1180.35040},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_2009_5_8_1_117_0/}
}